Actuator for control loading system

ABSTRACT

The present invention relates to an actuator for control loading system to produce the control force installed at the system which provides the control of such as the aircraft, the ship and the vehicles with the virtual simulation. More specifically, the present invention installed at the virtual simulation system, which relates to an actuator for control loading system, measures the force added while the force by the movement of the control stick is received in the horizontal direction, and connects a lever transmitting the control force equivalent to the added force and a reaction force to a direct drive motor, and includes a potentiometer which senses the initial reference position with sensing the angle of rotation separately from an encoder, and can limit the rotation range of the lever rotating and also fix the initial neutral position, and can be manufactured compactly on the whole.

TECHNICAL FIELD

The present invention relates to an actuator for control loading system to produce the control force installed at the system which provides the control of such as the aircraft, the ship and the vehicles with the virtual simulation. More specifically, the present invention installed at the virtual simulation system, which relates to an actuator for control loading system, measures the force added while the force by the movement of the control stick is received in the horizontal direction, and connects a lever transmitting the control force equivalent to the added force and a reaction force to a direct drive motor, and includes a potentiometer which senses the initial reference position with sensing the angle of rotation separately from an encoder, and can limit the rotation range of the lever rotating and also fix the initial neutral position, and can be manufactured compactly on the whole.

BACKGROUND ART

Virtual simulation is generally used for training control of aircraft, the ship, the vehicle or the heavy equipments. When the trainer trains the control using virtual simulation system, it makes the trainer feel the tactual sense, visual sense or movements with reality similar to the senses of the actual control.

Particularly, since the control stick (cyclic stick), the side stick or the foothold-type pedal, etc.

is the part which trainer directly operates, it should make the trainer feel tactually like as the trainer controls actually. Hereinafter, the configuration which the trainer operates directly is called as the control stick.

When the person moves the control stick (10) for control in the kind of real aircraft, the control stick receives not only the reaction force produced in the each configuration which is mechanically connected to the control stick but also the reaction force produced by virtue of fluid pressure or air force, and thereby the trainer feels the reaction forces on hand grasping the control stick. Commonly, these reaction forces are called as the control force. So in order to make the trainer feel the control force through the control stick when the trainer trains in the virtual simulation system, an actuator is installed to add the artificial control force to the control stick.

As the prior arts about this actuator, there are KR 10-0851232 B, KR 10-2004-0092108 A, KR 10-2009-0061508 A and KR 10-2004-0018465 A. The said prior arts are configured to provide the control force by driving the motor according to the movement of the control stick by mechanically connecting the motor to the control stick.

However, the said prior arts have the complicated installation structure because the mechanical link means is complicated to connect the control stick to the motor, and have the problem that undesirable force is added to motor by the weight of the control stick or link means because the motor is not configured to maintain horizontality. Owing to these problems, the accurate control force can not be adjusted when motor is using to add the control force.

Moreover KR 10-0851232 B, KR 10-2009-0061508 A, and KR 10-2004-0018465 A have the problem that the error is occurred in the process of transferring force because a reducer, a pulley or belt is included in the link means. In other words if the reducer is composed with a pair of gears meshing each other, the backlash is occurred because of the gap of the teeth, and as the pulley wound on the belt is used long time, the belt gets loose and thereby the pulley is turning idle. Meanwhile, KR 10-2004-0092108 A has not that problem because the motor is directly connected to the rotation axis of control stick, but has the limitation that it is applied to the virtual simulation for only restrictive uses because the installation structure of the motor is restricted.

In addition, the said prior arts sense the rotation angle of rotator including the motor by using the position sensor or encoder built in the motor, but in order to create the absolute reference point with one position sensor sensing the rotation angle, the delay of starting time established with software and inconvenience is accompanied whenever the power is supplied to the virtual simulation system.

Besides, to calculate the control force corresponding to the movement of control stick it is desirable to sense the magnitude of the force added to the actuator according to the movement of control stick, but the said prior arts do not include the force sensor to sense the magnitude of force and moreover even if the force sensor is installed, the installation position is improper because of the structure and the magnitude of force can not be accurately sensed.

PRIOR ARTS Patent Documents

(Patent document 1) KR 10-0851232 B1, 08.07.2008.

(Patent document 2) KR 10-2004-0092108 A, 11.03.2004.

(Patent document 3) KR 10-2009-0061508 A, 06.16.2009.

(Patent documents 4) KR 10-2004-0018465 A, 03.03.2004.

DISCLOSURE Technical Problem

Therefore, the object of the present invention is to provide the actuator for control loading system wherein the force received from the control stick and control force adding to the control stick can be transferred in the horizontal direction and also transferred through the direct connection method instead of including the transfer means such as a reducer or belt, and it is easy to mechanically connect to the control stick.

Another object of the present invention is to provide the actuator for control loading system wherein the rotation angle can be sensed and the absolute reference point which is the basis on the rotation angle can be established with accuracy and with ease and can be continuously used after once establishing work regardless of the operation intermittence of the virtual simulation system.

Another object of the present invention is to provide the actuator for control loading system which includes the force sensor, of which the installation position does not affect the whole structure and which can be installed easily.

Technical Solution

To attaining the above objects, the present invention is characterized by comprising; DD motor (400), which includes a stator, a rotor rotating around the stator by interacting with the said stator electrically, and an encoder sensing the rotation angle of rotor in the inside, wherein the stator is fixed at the lower part, the stator body (420) and the rotor is fixed at the upper part, the rotor body (410); and the fixture (300), which includes the upper fixture (310) supporting the said rotor body (410) of the DD motor (400) to rotate, the lower fixture (320) fixing the said stator body (420) of the DD motor (400), and the potentiometer (350) arranged in the rotation axis direction of the said rotor body(410); and the rotator (200), which includes the lever (210) of which the one end is fixed at the rotation axis position in the upper surface of the said rotor body (410) and of which the other end is rotating in the horizontal direction on the one end as an axis, and the shaft rod (230) installed vertically at the rotation axis position of the said rotor body (410) and fixed at the shaft (351) of the said potentiometer (350); and the force sensor (100), of which the one end is connected to the other of the said lever (210) to horizontally rotate and of which the other end is fixed to receive the force added to the control stick (10), and which generates the electric signal according to the change amount corresponding to the magnitude of the added force.

The said DD motor (400) is characterized by more comprising the hollow (430) penetrating vertically the rotor body (410) and the stator body (420) in the direction of the rotation axis, and the said potentiometer (350) fixed at the said lower fixture (320) to be arranged in the lower part of the said hollow (430), and the upper end of the shaft rod (230) is fixed at the said the rotor body (400) and the lower end is fixed at the shaft (351) of the said potentiometer through the hollow (430).

The upper fixture (310) of the said fixture (300) penetrates vertically the central part (312) to rotate the upper end of the said rotor body (410) with being inserted in the said central part (312), and the lever (210) of the said rotor (200) is fixed at the upper end of the rotor body (400) to be exposed at the upper part of the said upper fixture (310), and includes near the other end the through hole (212) penetrating vertically, and the inserting groove (311) is formed on the surface of the upper fixture (310) at the vertical lower part of the said through hole (212) in the neutral state that the force is not added to the control stick (10).

The stopper (360) is installed on the upper surface of the said upper fixture (310) to limit the rotation range of the said lever (210) with attaching the buffer (363) on the surface contacting the other end of the said lever (210).

Advantageous Effects

Accordingly, the present invention as configured above is not affected by the weight of link means connecting to the control stick because the force added to the control stick is transferred in the horizontal direction, and does not include the transfer means such as a reducer, a pulley or a belt which transfers the force by changing the rotation torque or rotation speed, but by using the direct drive motor, can keep the neutral position in a state that the force is not added to the control stick and thereby the added force can be accurately transferred to operate without error when the force is transferred.

Moreover the present invention senses the absolute position as a basis with the potentiometer and can also sense the rotation angle with encoder based on the accurate absolute position, because the accurate absolute position can be established by fixing the lever when the absolute point is established.

Furthermore, since the present invention installs the force sensor at the front end of the lever, it can be easily installed, manufactured compactly and sense the magnitude of the force with accuracy.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is the top perspective view showing the actuator for control loading system connecting to the control stick (10) according to an exemplary embodiment of the present invention;

FIG. 2 is the bottom perspective view showing the actuator for control loading system connecting to the control stick (10) according to an exemplary embodiment of the present invention;

FIG. 3 is the top perspective view showing the actuator for control loading system according to an exemplary embodiment of the present invention;

FIG. 4 is the analytic perspective view showing the actuator for control loading system according to an exemplary embodiment of the present invention;

FIG. 5 is the bottom perspective view showing the actuator for control loading system detaching the lower cover (340) according to an exemplary embodiment of the present invention.

BEST MODE FOR INVENTION

Hereinafter, the preferable embodiments of the present invention will be described with reference to accompanying figures so as to be easily used by a person ordinary skilled in the art. Note that the reference numbers for the configurations or the functions in attached figures are used the same numbers for the same configurations or the functions in other figures if it is possible. And in below description of the present invention, the detailed explanation is omitted in case the specific description related to the publicly known function or the publicly configuration makes unclear the gist of the present invention unnecessarily.

FIG. 1 is the top perspective view showing the actuator for control loading system connecting to the control stick (10) according to an exemplary embodiment of the present invention.

FIG. 2 is the bottom perspective view showing the actuator for control loading system connecting to the control stick (10) according to an exemplary embodiment of the present invention.

The actuator for the control force production according to the present invention is comprised, as described below, of the force sensor (100), the rotator (200), the fixture (300) and DD motor (400) to receive the force by the movement of control stick (10) through the force sensor (100) as shown in said FIG. 1 and FIG. 2.

Firstly, for the understanding of the present invention the brief explanation will be described about the control stick (10) and the gimbals (20) where the control stick is installed. The control stick (10) is installed at the upper part of the gimbals (20) to control the movement left and right (rolling) and the movement back and forth (pitching). The rotation axis (22) of the operating rod (24) rotating according to the rolling is installed at the member (25) rotating on other rotation axis (21) according to the pitching, and thereby rotates the other operating rod (23) fixed at the member (23). Herein the lower parts of the said operating rod (23, 24) rotate while the upper parts are fixed at the axes. Moreover, the said two operating rods (23, 24) are connected to the actuators which independently sense the movements of control stick (10) and add the reaction force by the movement of the control stick (10) to the control stick (10). Meanwhile, the control stick (10) can be allowed to control only the pitching according to the use and in this case the only one actuator is installed. Furthermore, the actuator can be installed at the control means such as foothold-type pedal or side stick, instead of the kind of stick in FIG. 1 and FIG. 2.

Since the present invention relates to the actuator connecting the control means which the trainer controls such as the control stick, pedal or the side stick, note that the control stick (10) applied to the exemplary embodiment of the present invention is explained as the representative of the various control means.

As shown in said FIG. 1 and FIG. 2 showing the exemplary embodiment of the present invention, the present invention receives the force added to the control stick (10) as the rotation force of the operating rods (23, 24), and makes the trainer feel the reaction force from the control stick (10) corresponding to the force added through operating rods (23, 24).

In the explanation of the present invention, note that for convenience the only one operating rod (23) is connected to the actuator for control loading system in figures.

In other words, as shown in figures, the actuator for control loading system according to the exemplary embodiment of the present invention receives the rotation force of operating rod (23) through the rod (30) and the link (40) at the force sensor (10). In detail, the one end of rod (30) is connected with bearing to the lower end of the operating rod (23) to rotate vertically where the rotation axis is in the horizontal direction, and the other end of the said rod (30) is connected with bearing to the one end of “L”-shaped link (40) to rotate horizontally where the rotary axis is in the vertical direction, and the other end of the said link (40) is connected with bearing to the force sensor installed at the actuator for control loading system where the rotation axis is in the vertical direction. Herein, in order to connect the force sensor (100) with the link (40), the connecting rod (120) having the bearing connection is additionally installed at the other end of the link (40) to connect with insertion to the force sensor (100).

In this way, the actuator for control loading system according to the present invention is configured to receive the force added to the control stick (10) in the horizontal direction when the actuator is connected to the control stick (10) and the gimbals (20), and in the horizontal direction to receive the force added to the force sensor (100) according to the movement of the control stick (10). And as described below, the lever (210) of the rotator (200) is configured to rotate in the horizontal direction around the rotation axis by the force received through the force sensor so that the force added to force sensor (100) is removed when the force is not added to the control stick (10). Eventually, the neutral state can be kept without rolling and pitching if the control stick (10) is not moved.

That is, if the lever (210) of the rotator (200) described below rotates in the vertical direction around the rotation axis of the horizontal direction by the force added to the force sensor (100), even in the neutral state that the force is not added to the control stick (10), the lever (210) is sagging to the lower direction by the weight of the said rod (30) and link (40) and thereby it is occurred the problem that the actuator operates wrong as if the trainer controls even though the trainer does not control.

Thus, in order not to operate in neutral state, the present invention is configured to receive the force in horizontal direction and thereby the lever (210) of the rotator (200) rotates based on the axis of the vertical direction.

In the meantime, the configuration to transfer the force added to the operating rods (23, 24) of the gimbals (20) to the present invention is not limited on the configurations by the rod (30) and link (40), but is allowed to connect directly with bearing the said rod (30) to the force sensor (100) of the present invention without using the said link (40), but is allowed to install with the various elements for replacing the said link (40). Therefore the present invention can connect the control stick in various types according to the installation position or usage.

Meanwhile, in the exemplary embodiment as shown in FIG. 1 and FIG. 2, since the operating rod (23, 24) of the said gimbals (20) rotates the lower part centering around the rotation axis (21, 22) of the upper part, the said rod (30) moves a little bit in the vertical direction. Therefore, it is desirable that at least one of the bearings (31, 32, 121) is a Rod End Bearing to rotate freely in the certain range of the axis.

FIG. 3 is the top perspective view showing the actuator for control loading system according to an exemplary embodiment of the present invention.

FIG. 4 is the analytic perspective view showing the actuator for control loading system according to an exemplary embodiment of the present invention.

FIG. 5 is the bottom perspective view showing the actuator for control loading system detaching the lower cover (340) according to an exemplary embodiment of the present invention.

Firstly, in the drawing of the said FIG. 4, note that since a plurality of bolts are used for connection, with the consideration of complexity of the figure, it is showed with the dashed line for a bolt connection to one element with other element and if the bolt connections are plural, the just one connection selected is showed with the dashed line.

As shown, the actuator for control loading system according to the exemplary embodiment of the present invention comprises; a rotator (200) which receives the control force of the control stick (10) to rotate around the vertical axis; the force sensor (100) which outputs the signal according to the magnitude of the control force by installing on the transfer line of force to transfer the control force of the said control stick (10) to the rotator (200); the DD motor (400) which rotates by the said rotator (200) and provides the control force (reaction force) as well; and the fixture (300) which supports the said DD motor (400).

the fixture (300), which includes the upper fixture (310) supporting the said rotor body (410) of the DD motor (400) to rotate, the lower fixture (320) fixing the said stator body (420) of the DD motor (400), and the potentiometer (350) arranged in the rotation axis direction of the said rotor body(410); and

the rotator (200), which includes the lever (210) of which the one end is fixed at the rotation axis position in the upper surface of the said rotor body (410) and of which the other end is rotating in the horizontal direction on the one end as an axis, and the shaft rod (230) installed vertically at the rotation axis position of the said rotor body (410) and fixed at the shaft (351) of the said potentiometer (350); and the force sensor (100), of which the one end is connected to the other of the said lever (210) to horizontally rotate and of which the other end is fixed to receive the force added to the control stick (10), and which generates the electric signal according to the change amount corresponding to the magnitude of the added force.

The said DD motor, the direct drive motor, includes a stator (not illustrated), a rotor (not illustrated) rotating around the stator by interacting with the said stator electrically, and an encoder (not illustrated) sensing the rotation angle of rotor in the inside, wherein in a state that the stator body (420) supporting stator is put at the lower part, the rotor body (410) supporting the rotor is installed at the upper part so that the rotor body (410) is allowed to rotate around the stator body (420). In addition, as shown in FIG. 5, the outlet (422) is installed at the lower surface (421) of the stator body (420) to draw out the electric line (not illustrated) and the control line (not illustrated). Moreover, such rotation is controlled by the control device (not illustrated) of outside and the rotation angle sensed by encoder is transferred to the control device (not illustrated) of outside.

Since this kind of DD motor (400) is the publicly known configuration, the detailed explanation for the internal element is omitted. But in the present invention, the stator body (420) of the said DD motor (400) is firmly fixed at the stator (300), and the rotor body (410) is supported by the stator (300) to rotate, and the said rotator (200) is fixed at the rotor body (410) of the said DD motor (400). Therefore, the force transferred to the rotator (200) is directly transferred to the rotor body (410) of the said DD motor (400) without passing through the transfer means such as the reducer and the belt, which changes the power. Since the action of the said DD motor (400) is controlled by the control device (not illustrated) of outside, the reaction force added to the said rotor body (410) is directly added to the rotator (200) without passing through the transfer means of force.

In addition, the said DD motor (400) includes the hollow (400) which penetrates vertically the rotor body (410) and the stator body (420) in the direction of the rotation axis, and thereby has the shapes of the vertical penetration on the whole. Herein the center of the horizontal section of the said hollow (430) becomes the rotation axis.

The said fixture (300) is comprising; the upper fixture (310) which supports the rotor body (410) of the said DD motor (400) to rotate; the lower fixture (320) which fixes the stator body (420) of the said DD motor (400) not to move; and the potentiometer (350) which is arranged in the direction of rotation axis of the said rotor body (410) and which is fixed at the said lower fixture (320).

Specifically, the upper fixture (310) is formed like a sheet penetrating the central part (312) vertically. In the exemplary embodiment of the present invention, in order to support to rotate the said DD motor (400), the rotation sheet (220) of the rotator (200) described below is fixed at the upper surface of the rotor body (410) of the said DD motor (400) and installed at the said the central part (312) to rotate.

The said lower fixture (320) has the internal space so that the said potentiometer (350) is included and the said DD motor (400) is connected with the electric wire and so that the lower is covered with the lower cover (340) and the connector is installed at the side to electrically connect with the control device (not illustrated) of outside and the cramp (323) is installed at the outside to fix firmly with the frame (not illustrated). In addition, the said lower fixture (320) forms the through hole (322) on the upper surface and fixed at the said lower fixture (320) by using the supporter (352) where the said potentiometer (350) is arranged in the lower part of the hollow (430) of the said DD motor (400) to draw out the electric wire (not illustrated) and control line (not illustrated) from the said DD motor (400) in a state that the said DD motor (400) is firmly fixed at the surface (321) of the said lower fixture (320). Moreover, the shaft rod (230) described below which penetrates the hollow (430) of the said DD motor (400) is fixed at the shaft (351) of the said potentiometer (350).

And the upper fixture (310) and the lower fixture (320) are connected with a plurality of long belt (313) to each other along the edge where the DD motor (400) is installed between the upper fixture (310) and the lower fixture (320).

Herein, to explain the potentiometer (350), the said potentiometer (350) outputs the analog signal corresponding to the rotation angle if the shaft (351) projected upward is rotated. The present invention senses the analog signal of the said potentiometer (350) to recognize the initial position of the rotator (200) as the absolute position or the reference position where the initial position is the position that the control stick (10) is not moved to put in neutral position.

The said rotator (200) is comprising; the lever (200) which rotates according to the movement of the control stick (10), the shaft rod (230) which is fixed at the shaft (351) of the said potentiometer (350) by being inserted in the hollow (430) of the said DD motor (400); and the rotation sheet (220) which fixes the said lever and the shaft rod (230) at the rotor body (410) of the said DD motor (400) and which supports the rotor body (410) with the upper fixture (310) to rotates.

Specifically, the said rotation sheet (200) is formed with the body of sheet and fixed at the upper surface of the said rotor body (410). In addition, the inserting sheet (221) is fixed at the upper surface wherein the inserting sheet (221) projects with a circle shape fitting the edge of the central part (312) of the said upper fixture (310) so that the rotor body (410) supported with the said upper fixture (310) is allowed to rotate wherein the inserting sheet is inserted to the said central part (312)

And the said lever (210) is arranged horizontally and the one end of which is fixed at the rotation axis position of the said rotor body (410) in the upper surface of the said inserting sheet (221). Accordingly, the said lever (210) is exposed to the said upper fixture (310) to rotate.

In addition the said shaft rod (230) is fixed at the rotation axis position of the said rotor body (410) in the lower surface of the said rotation sheet (220) in the bottom direction to be inserted in the hollow (430) of the said DD motor (400). The bottom end of the said shaft rod (230) is connected to the shaft (351) of the said potentiometer (350) by using the coupling (231).

According to the rotator (200) configured as described above, if the said lever (210) is rotated in the horizontal direction, the said rotor body (410) of the DD motor (400) fixed at the rotation sheet (220) rotates together, and if it is controlled to add the control force (the reaction force) to the said DD motor (400), the control force is added to the rotor body (410) to be transferred to the said lever (210) and eventually is transferred to the control stick (10). Besides, since the rotation force of the said lever (210) is transferred to the shaft (351) of the said potentiometer (350) through the said shaft rod (230), the said potentiometer can senses the rotation.

The said force sensor (100), which is installed between the link transferring the force added to control stick (10) and the other end of the said lever (210), transfers the force added to the control stick (10) to the lever (200) and also senses the magnitude of the transferred force. It is preferable that the said force sensor (100) is composed of the load cell which can measures the value of the electric signal corresponding to the amount of the shape displacement.

In the exemplary embodiment of the present invention, the connecting rod (110) is connected with bearing (211, 111) to the other end of the said lever (210) and rotates in the horizontal direction around the rotation axis of the vertical direction. The said force sensor (100) is fixed at the end of the said connecting rod (110) and connects the link at the opposition end of the said connecting rod (110) connected. The bearing (111) connection between the said connecting rod (110) and the said lever (210) is formed like that the bearing (111) with the rotation axis of the vertical direction is installed at the end of the said connecting rod (110), and that the indent groove is configured in the horizontal direction at the end of the said lever (210), and that the through hole (213) is formed from the top to the bottom of the indent groove, and that thereafter the said bearing (111) is inserted with the bolt (211) at the indent groove through the through hole (213).

The said force sensor (100) installed as described above is fixed at the said connecting rod (100) to receive the force added to the control stick (10). So the said force sensor (100) is changed the shape according to the magnitude of the force and thereafter generates the electric signal corresponding to the amount of change to transfer to the control device (not illustrated) of outside.

Meanwhile, in the exemplary embodiment of the present invention, in order to sense with accuracy the initial rotation position in the initial state that the force is not added to the lever (210), that is, in the neutral state that the control stick (10) is not moved, the through hole (212) penetrating the said lever (210) from top to bottom is formed, and in initial and neutral state, the inserting groove (311) is formed at the junction of the upper surface of the said upper fixture (310) and of the vertically lower position of the said through hole (212).

Accordingly, to set up the initial state the separate pin (215) is inserted in the said inserting groove (311) through the said through hole (212) to stop the rotation of the lever (210) and then the initial position is established by the analog sense signal output from the said potentiometer (350) and after the initial setting is completed, the said pin (212) is drawn out to rotate the lever (210) according to the movement of the control stick (10).

In addition, the exemplary embodiment of the present invention includes the stoppers (360) on the upper surface of the said upper fixture (310) to limit physically the rotation range of the lever (210).

That is, after the rotation angle corresponding to the rotation range of the said lever (210) based on the neutral position of the said lever (210) is decided, the said stoppers (360) is installed at the both positions corresponding to the decided rotation angle, namely at the upper surface of the said upper fixture (310). And each of the stoppers (360) installed on the both positions comprises; the stopper body (361) fixed on the upper surface of the said upper fixture (310); the rod (362) fixed with a nut (361) at the side contacting the said lever (210) in the sides of stopper body and the buffer (363) fixed at the end of the said rod (362). Herein the said buffer (363) functions as a absorbing-shock material when the buffer contacts the said lever (210) rotating.

Therefore, the said stopper (360) limits the maximum range of the rotation angle of the said lever (210), That is, when the control force (reaction force) is added to the said DD motor (400) according to the control of the control device (not illustrated) of outside, the rotation angle of the lever (210) is limited with software. However if the force is added excessively from the control stick (10) so that the lever would rotate beyond the range of the rotation angle limited with software, in that case the stopper limits the maximum rotation angle.

The actuator for control loading system according to the present invention is connected mechanically to the control stick (10) through the link (40), the rod (30) and the gimbals (20), and is connected electrically to the control device (not illustrated) of outside, and is used like the following to implement the simulation system producing the control force.

Firstly, to establish the initial state that the control stick (10) is not moved, the lever (210) is fixed at the upper fixture not to rotate by using the pin (215) inserted in the through hole (212) of the lever (210) and the inserting groove of the upper fixture (310). And thereafter the control device (not illustrated) of outside establishes the initial central position by using analog signal output from the potentiometer (350)

After the initial position is established, the said pin (215) is removed to implement the actuator for control loading system according to the transferred force from the control stick (10) and the control device (not illustrated) of outside.

That is, if the lever (210) receives the force and rotates according to the movement of the control stick (10), the force sensor senses the added force to transfer to the control device (not illustrated) of outside and the encoder (not illustrated) installed at the inside of DD motor (400) senses the rotation angle of the rotor body (410) of DD motor (400). And thereafter the control device (not illustrated) of outside obtains the target position from the magnitude of the sensed force based on the pre-established model formula consisting of the elements of acceleration, the velocity and position, and uses the obtained target position as the data for the simulation.

In addition, the control device (not illustrated) of outside controls DD motor (400) to add the control force (reaction force) through the actuator of the present invention wherein the control force corresponds to the acceleration, velocity and position according to the magnitude of the force. In other words, the control device (not illustrated) of outside calculates the rotation force to add to the rotor body (410) of DD motor (400) according to the acceleration, velocity and the position calculated from the magnitude of the force, and thereafter rotates the rotor body (410) of the DD motor (400). At the same time, the control device (not illustrated) of outside drives the said DD motor (400) to generate the targeting control force as a rotation force for DD motor (400) by increasing or decreasing the change amount of the elements of rotation position, rotation velocity and rotation acceleration based on the rotation angle sensed at the encoder (not illustrated).

Herein, the driving rotation force of DD motor (400) corresponds to the control force which the trainer feels through the control stick as a reaction force with moving the control stick, not in the virtual simulation system but in the real aircraft, the ships and so on.

In this way, the present invention used for simulation system can establish the initial central position by using the potentiometer (350) so that it does not need to repeat with inconvenience initial establishing work by using the advantage of the potentiometer (350) that does not change the signal at the initial central position even if the power is turned off and then turned on again. Furthermore, the initial central position can be established accurately because the lever (210) can be fixed by using the inserting groove (311) of the upper fixture (310) and the through hole (212) of the lever (210) when the initial central position is established.

Moreover, since the encoder (not illustrated) of DD motor (400) senses the rotation angle of the lever (210) on the basis of the established initial central position, the present invention can accurately obtain the target control position and the control force by using the accuracy of digital signal output from the encoder (not illustrated). That is, since the encoder (not illustrated) senses the rotation angle with digital, the driving of the DD motor (400) can be accurately sensed with no noise and with the excellent resolution. And the initial central position can be established with the potentiometer by making up for the disadvantage of the encoder (not illustrated) that the reference point should be established to sense the initial central position whenever the power is turned on. Meanwhile since the potentiometer (350) senses the position with analog signal with much noise, the present invention uses the potentiometer only to establish the initial central position.

Accordingly, the present invention uses the encoder (not illustrated) of DD motor (400) and the potentiometer (300) of the fixture (300) together and thereby obtains the accurate target control position and control force.

Moreover, because the lever (210) rotates with keeping the horizontal level, the present invention can prevent from adding the unwanted force occurred by the weight of link means (30, 40) which connects mechanically lever (210) to the operating rod (23, 24) of the gimbals (20) connected to the control stick (10), and therefore it does not need to install the separate plumb bob to compensate the weight of the said link means (30, 40), and thereby the force by the movement of the control stick (10) is only transferred to the lever (210) with accuracy so that the accurate control force is produced.

Moreover, the force sensor (10) is not installed at the inside of the present invention comprising the rotator (200), the fixture (300) and the DD motor (400), but installed at the front end of the lever (210) receiving the movement of the control stick (10). So the present invention can be manufactured compactly and the force added to the lever (210) is accurately sensed in halfway.

Furthermore, the present invention uses the DD motor (400), the direct drive motor and does not include the auxiliary means such as the force transfer device comprising a reducer, a pulley or a belt. Therefore the present invention can improve the efficiency of the force transfer and force transfer. In other words, since the auxiliary means as described above transfer the rotation force by increasing or decreasing the rotation torque or rotation velocity, the energy loss is occurred in the process of the transferring rotation force. But the present invention can transfer the force accurately without the deterioration of the rotation force because of not including such auxiliary means, and moreover can accurately receive the movement of the control stick (10) and accurately transfer the control force to the control stick (10) because the error is not occurred by a backlash or the idle turn of a pulley.

Furthermore, the present invention not only limits with software the rotation range of the lever (210) with the DD motor (400) driven by the control device (not illustrated) of outside, but also limits the rotation range of the lever (210) with the stopper (360) even if the rotation range goes beyond the limited range of software due to the excessive force. So the damage according to the excessive force can be prevented.

In the above, although the exemplary embodiment of the present invention has been described to illustrate the invention in order to explain the technical idea of the present invention, the present invention is not limited to the detailed exemplary embodiment, the same configuration and function as described above. The numerous variations can be used in the limit without departing from the range of the present invention. It is intended that all such variations are included within the range of the present invention and therefore, the range of the present invention should be determined by the appended claims.

THE DESCRIPTION OF REFERENCE NUMBERS

10: control stick 20: gimbals 21, 22: rotation axis 23, 24: operating rod 30: rod 31, 32: bearing 40: link 100: force sensor 110: connecting rod 111: bearing 120: connecting rod 200: rotator 210: lever 211: bolt 212: through hole 220: rotation sheet 221: inserting sheet 230: shaft rod 231: coupling 300: fixture 310: upper fixture 311: inserting groove 320: lower fixture 330: connector 340: lower cover 350: potentiometer 351: shaft 352: supporter 360: stopper 361: stopper body 362: rod 363: buffer 364: nut 400: DD motor 410: rotor body 420: stator body 430: hollow 

1. The actuator for control loading system characterized by comprising; DD motor, which includes a stator, a rotor rotating around the stator by interacting with the said stator electrically, and an encoder sensing the rotation angle of rotor in the inside, wherein the stator is fixed at the lower part, the stator body and the rotor is fixed at the upper part, the rotor body; and the fixture, which includes the upper fixture supporting the said rotor body of the DD motor to rotate, the lower fixture fixing the said stator body of the DD motor, and the potentiometer arranged in the rotation axis direction of the said rotor body; and the rotator, which includes the lever of which the one end is fixed at the rotation axis position in the upper surface of the said rotor body and of which the other end is rotating in the horizontal direction on the one end as an axis, and the shaft rod installed vertically at the rotation axis position of the said rotor body and fixed at the shaft of the said potentiometer; and the force sensor, of which the one end is connected to the other of the said lever to horizontally rotate and of which the other end is fixed to receive the force added to the control stick, and which generates the electric signal according to the change amount corresponding to the magnitude of the added force.
 2. The actuator for control loading system as in claim 1, wherein the said DD motor is characterized by more comprising the hollow penetrating vertically the rotor body and the stator body in the direction of the rotation axis, and the said potentiometer fixed at the said lower fixture to be arranged in the lower part of the said hollow, and the upper end of the shaft rod is fixed at the said the rotor body and the lower end is fixed at the shaft of the said potentiometer through the hollow.
 3. The actuator for control loading system as in claim 2, wherein the upper fixture of the said fixture penetrates vertically the central part to rotate the upper end of the said rotor body with being inserted in the said central part, and the lever of the said rotor is fixed at the upper end of the rotor body to be exposed at the upper part of the said upper fixture, and includes near the other end the through hole penetrating vertically, and the inserting groove is formed on the surface of the upper fixture at the vertical lower part of the said through hole in the neutral state that the force is not added to the control stick.
 4. The actuator for control loading system as in claim 3, wherein the stopper is installed on the upper surface of the said upper fixture to limit the rotation range of the said lever with attaching the buffer on the surface contacting the other end of the said lever. 